3.73, 3.90 or 4.10?

Coupe50h · 11-15-2004, 03:57 PM

Guys, I finally have a beater to drive now, and my stang sits in the garage except for weekends, or track visits. So i want more gear now, but dont want to buy different slicks.
I run a 26x8.5 m/t on 15in draglite, will i have to shift to 5th in the 1/4 with 4.10? I DONT WANT 5TH gear in the 1/4........ im looking for low.mid 1.6 60's if possible though, how about the newer 3.90 ratio?

also im putting 4cyl springs in the rear, and probaly 70/30's up front. Right now i have stock struts/springs and lak 50/50's in the back, im looking to pull the wheels just a tad on a 5k launch.

btw, i hear in an old thread you dont want 4.10's on a car unless it can pull to about 6500 rpms, or else it can slow you down, is this true?

thnx for any opinions.

andy669 · 11-15-2004, 05:34 PM

With a 4.10 it looks like you'd be going through the traps at about 5500-5600. That is using your trap speed that you have listed in your sig, and I figured your tire rollout at 82 inches. Its better to measure the actual circumference of the tire instead of calculating it based on diameter. They can be as much as a couple inches off. Obviously if you do some more mods to increase power, you will have more MPH and run through the traps at a higher RPM.

I recommend the stock V8 springs for the rear, and the 4 cylinder springs up front.

Andy

Coupe50h · 11-15-2004, 05:43 PM

well with it colder now, i could probaly see that trap again, but on slicks it averages 105.
5600 rpm sounds good, my e-cam should'nt die off too much at that point, i guess only a dyno will tell.

ok, well i'll keep the rear springs, and do the fronts only. thnx for the input.

well now im worried about spraying it, i guess i would just have to get taller tire when i install the juice, thanx alot, 4.10 it is!

88workcar · 11-16-2004, 06:28 AM

Do not be afraid of gear, I run 4.30s and still occasionally use my 26es.

11-15-2004, 03:57 PM	#1
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	3.73, 3.90 or 4.10? Guys, I finally have a beater to drive now, and my stang sits in the garage except for weekends, or track visits. So i want more gear now, but dont want to buy different slicks. I run a 26x8.5 m/t on 15in draglite, will i have to shift to 5th in the 1/4 with 4.10? I DONT WANT 5TH gear in the 1/4........ im looking for low.mid 1.6 60's if possible though, how about the newer 3.90 ratio? also im putting 4cyl springs in the rear, and probaly 70/30's up front. Right now i have stock struts/springs and lak 50/50's in the back, im looking to pull the wheels just a tad on a 5k launch. btw, i hear in an old thread you dont want 4.10's on a car unless it can pull to about 6500 rpms, or else it can slow you down, is this true? thnx for any opinions. __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

11-15-2004, 05:34 PM	#2
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	Re: 3.73, 3.90 or 4.10? With a 4.10 it looks like you'd be going through the traps at about 5500-5600. That is using your trap speed that you have listed in your sig, and I figured your tire rollout at 82 inches. Its better to measure the actual circumference of the tire instead of calculating it based on diameter. They can be as much as a couple inches off. Obviously if you do some more mods to increase power, you will have more MPH and run through the traps at a higher RPM. I recommend the stock V8 springs for the rear, and the 4 cylinder springs up front. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

11-15-2004, 05:43 PM	#3
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	Re: 3.73, 3.90 or 4.10? well with it colder now, i could probaly see that trap again, but on slicks it averages 105. 5600 rpm sounds good, my e-cam should'nt die off too much at that point, i guess only a dyno will tell. ok, well i'll keep the rear springs, and do the fronts only. thnx for the input. well now im worried about spraying it, i guess i would just have to get taller tire when i install the juice, thanx alot, 4.10 it is! __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

11-16-2004, 06:28 AM	#4
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	Re: 3.73, 3.90 or 4.10? Do not be afraid of gear, I run 4.30s and still occasionally use my 26es. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
3.73 v. 4.10 Gears	GTMustang96	Modular Madness	20	03-20-2003 06:36 PM
RPM difference between 3.73 to 4.10	o2superstang	Modular Madness	0	07-09-2002 06:58 PM
1/4 mile 3.73 or 4.10	93 Cobra needs input	Windsor Power	5	01-28-2002 12:36 AM
how much diff. between 3.73 and 4.10 in aod	stng87	Windsor Power	4	02-27-2001 11:40 PM
3.55, 3.73 or 4.10	Mouse Eater	Windsor Power	12	01-15-2001 08:03 AM